
function getQuery(item){
    var svalue = location.search.match(new RegExp("[\?\&]" + item + "=([^\&]*)(\&?)","i"));
    return svalue ? svalue[1] : svalue;
};

function getCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');    //把cookie分割成组
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];                      //取得字符串
        while (c.charAt(0)==' ') {          //判断一下字符串有没有前导空格
            c = c.substring(1,c.length);      //有的话，从第二位开始取
        }
        if (c.indexOf(nameEQ) == 0) {       //如果含有我们要的name
            return unescape(c.substring(nameEQ.length,c.length));    //解码并截取我们要值
        }
    }
    return false;
}

//清除cookie
function clearCookie(name) {
    setCookie(name, "", -1);
}

//设置cookie
function setCookie(name, value, seconds) {
    seconds = seconds || 0;   //seconds有值就直接赋值，没有为0，这个根php不一样。
    var expires = "";
    if (seconds != 0 ) {      //设置cookie生存时间
        var date = new Date();
        date.setTime(date.getTime()+(seconds*1000));
        expires = "; expires="+date.toGMTString();
    }
    document.cookie = name+"="+escape(value)+expires+"; path=/";   //转码并赋值
}  